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[NET]: Relax the reference counting of init_net_ns

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When the CONFIG_NET_NS is n there's no need in refcounting
the initial net namespace. So relax this code by making a
stupid stubs for the "n" case.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2007-11-01 00:43:49 -07:00 • committed by David S. Miller
parent 1dba323b3f
commit d46557955f
1 changed files with 25 additions and 8 deletions
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33
include/net/net_namespace.h
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@ -51,13 +51,12 @@ static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
} }
#endif #endif
#ifdef CONFIG_NET_NS
extern void __put_net(struct net *net); extern void __put_net(struct net *net);
static inline struct net *get_net(struct net *net) static inline struct net *get_net(struct net *net)
{ {
#ifdef CONFIG_NET
atomic_inc(&net->count); atomic_inc(&net->count);
#endif
return net; return net;
} }
@ -75,26 +74,44 @@ static inline struct net *maybe_get_net(struct net *net)
static inline void put_net(struct net *net) static inline void put_net(struct net *net)
{ {
#ifdef CONFIG_NET
if (atomic_dec_and_test(&net->count)) if (atomic_dec_and_test(&net->count))
__put_net(net); __put_net(net);
#endif
} }
static inline struct net *hold_net(struct net *net) static inline struct net *hold_net(struct net *net)
{ {
#ifdef CONFIG_NET
atomic_inc(&net->use_count); atomic_inc(&net->use_count);
#endif
return net; return net;
} }
static inline void release_net(struct net *net) static inline void release_net(struct net *net)
{ {
#ifdef CONFIG_NET
atomic_dec(&net->use_count); atomic_dec(&net->use_count);
#endif
} }
#else
static inline struct net *get_net(struct net *net)
{
return net;
}
static inline void put_net(struct net *net)
{
}
static inline struct net *hold_net(struct net *net)
{
return net;
}
static inline void release_net(struct net *net)
{
}
static inline struct net *maybe_get_net(struct net *net)
{
return net;
}
#endif
#define for_each_net(VAR) \ #define for_each_net(VAR) \
list_for_each_entry(VAR, &net_namespace_list, list) list_for_each_entry(VAR, &net_namespace_list, list)